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Title: Optimizing beam transport in rapidly compressing beams on the neutralized drift compression experiment – II

Abstract

The Neutralized Drift Compression Experiment-II (NDCX-II) is an induction linac that generates intense pulses of 1.2 MeV helium ions for heating matter to extreme conditions. Here, we present recent results on optimizing beam transport. The NDCX-II beamline includes a 1-m-long drift section downstream of the last transport solenoid, which is filled with charge-neutralizing plasma that enables rapid longitudinal compression of an intense ion beam against space-charge forces. The transport section on NDCX-II consists of 28 solenoids. Finding optimal field settings for a group of solenoids requires knowledge of the envelope parameters of the beam. Imaging the beam on the scintillator gives the radius of the beam, but the envelope angle is not measured directly. We demonstrate how the parameters of the beam envelope (radius, envelop angle, and emittance) can be reconstructed from a series of images taken by varying the B-field strengths of a solenoid upstream of the scintillator. We use this technique to evaluate emittance at several points in the NDCX-II beamline and for optimizing the trajectory of the beam at the entry of the plasma-filled drift section.

Authors:
 [1];  [2];  [2];  [3];  [4];  [4];  [3];  [4];  [4];  [4]
  1. Univ. of Washington, Seattle, WA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1458509
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Matter and Radiation at Extremes (Online)
Additional Journal Information:
Journal Volume: 3; Journal Issue: 2; Journal ID: ISSN 2468-080X
Publisher:
Science and Technology Information Center, China Academy of Engineering Physics; Elsevier
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Stepanov, Anton D., Barnard, John J., Friedman, Alex, Gilson, Erik P., Grote, David P., Ji, Qing, Kaganovich, Igor D., Persaud, Arun, Seidl, Peter A., and Schenkel, Thomas. Optimizing beam transport in rapidly compressing beams on the neutralized drift compression experiment – II. United States: N. p., 2018. Web. doi:10.1016/j.mre.2018.01.001.
Stepanov, Anton D., Barnard, John J., Friedman, Alex, Gilson, Erik P., Grote, David P., Ji, Qing, Kaganovich, Igor D., Persaud, Arun, Seidl, Peter A., & Schenkel, Thomas. Optimizing beam transport in rapidly compressing beams on the neutralized drift compression experiment – II. United States. doi:10.1016/j.mre.2018.01.001.
Stepanov, Anton D., Barnard, John J., Friedman, Alex, Gilson, Erik P., Grote, David P., Ji, Qing, Kaganovich, Igor D., Persaud, Arun, Seidl, Peter A., and Schenkel, Thomas. Thu . "Optimizing beam transport in rapidly compressing beams on the neutralized drift compression experiment – II". United States. doi:10.1016/j.mre.2018.01.001. https://www.osti.gov/servlets/purl/1458509.
@article{osti_1458509,
title = {Optimizing beam transport in rapidly compressing beams on the neutralized drift compression experiment – II},
author = {Stepanov, Anton D. and Barnard, John J. and Friedman, Alex and Gilson, Erik P. and Grote, David P. and Ji, Qing and Kaganovich, Igor D. and Persaud, Arun and Seidl, Peter A. and Schenkel, Thomas},
abstractNote = {The Neutralized Drift Compression Experiment-II (NDCX-II) is an induction linac that generates intense pulses of 1.2 MeV helium ions for heating matter to extreme conditions. Here, we present recent results on optimizing beam transport. The NDCX-II beamline includes a 1-m-long drift section downstream of the last transport solenoid, which is filled with charge-neutralizing plasma that enables rapid longitudinal compression of an intense ion beam against space-charge forces. The transport section on NDCX-II consists of 28 solenoids. Finding optimal field settings for a group of solenoids requires knowledge of the envelope parameters of the beam. Imaging the beam on the scintillator gives the radius of the beam, but the envelope angle is not measured directly. We demonstrate how the parameters of the beam envelope (radius, envelop angle, and emittance) can be reconstructed from a series of images taken by varying the B-field strengths of a solenoid upstream of the scintillator. We use this technique to evaluate emittance at several points in the NDCX-II beamline and for optimizing the trajectory of the beam at the entry of the plasma-filled drift section.},
doi = {10.1016/j.mre.2018.01.001},
journal = {Matter and Radiation at Extremes (Online)},
issn = {2468-080X},
number = 2,
volume = 3,
place = {United States},
year = {2018},
month = {2}
}

Works referenced in this record:

Irradiation of materials with short, intense ion pulses at NDCX-II
journal, May 2017


Development and testing of a pulsed helium ion source for probing materials and warm dense matter studies
journal, February 2016

  • Ji, Q.; Seidl, P. A.; Waldron, W. L.
  • Review of Scientific Instruments, Vol. 87, Issue 2
  • DOI: 10.1063/1.4932569

Ferroelectric plasma sources for NDCX-II and heavy ion drivers
journal, January 2014

  • Gilson, E. P.; Davidson, R. C.; Efthimion, P. C.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 733
  • DOI: 10.1016/j.nima.2013.05.091

Physics of neutralization of intense high-energy ion beam pulses by electrons
journal, May 2010

  • Kaganovich, I. D.; Davidson, R. C.; Dorf, M. A.
  • Physics of Plasmas, Vol. 17, Issue 5
  • DOI: 10.1063/1.3335766

New technique to measure emittance for beams with space charge
journal, August 2013

  • Poorrezaei, K.; Fiorito, R. B.; Kishek, R. A.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 16, Issue 8
  • DOI: 10.1103/PhysRevSTAB.16.082801

Tomographic phase-space mapping of intense particle beams using solenoids
journal, December 2007

  • Stratakis, D.; Tian, K.; Kishek, R. A.
  • Physics of Plasmas, Vol. 14, Issue 12
  • DOI: 10.1063/1.2823037

Generation of initial kinetic distributions for simulation of long-pulse charged particle beams with high space-charge intensity
journal, November 2009

  • Lund, Steven M.; Kikuchi, Takashi; Davidson, Ronald C.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 12, Issue 11
  • DOI: 10.1103/PhysRevSTAB.12.114801